Getting to the moon without a "4000 tonne" class is a parallel work, BUT neither a temporary stopgap nor an alternative/optional/additional work.
That was 2010, 3 CZ-5DY. It is for the first phase of man on the moon. Since CZ-5DY is replaced by "921", IF they still plan a first phase, it will be 2 "921" instead because total LEO payload of 3 CZ-5DY is 150 tonne which is roughly translated to around LTO 50 tonne, the Apollo mass for 3 men, while two "921" can deliver LTO 55 tonne.A Chinese space scientist did elaborate on a way to go the moon using not one by 3 Long March 5 launches.
The Shenyang Institute of Automation (SIA) announced on Thursday that China's first solar sail, SIASAIL-I, has successfully verified a number of key technologies in orbit, a big breakthrough in China's solar sail development.
The solar sail developed by the institute of the Chinese Academy of Sciences based in Northeast China's Liaoning province is a spacecraft powered by the reflected light pressure of the sun on the spacecraft's membrane. Because it does not consume additional chemical fuel, a solar sail is considered to be the one and only spacecraft that may reach outside the solar system. It can be applied to a wide range of fields, including asteroid exploration, geomagnetic storm monitoring, solar polar exploration and space debris removal.